Spring hydrographs as indicators of droughts in a karst environment
- Permanent Link:
- Spring hydrographs as indicators of droughts in a karst environment
- Series Title:
- Journal of Hydrology
- Fiorillo, Francesco
- Publication Date:
- Subjects / Keywords:
- Karst Spring ( local )
Hydrograph ( local )
Drought ( local )
Forecast ( local )
Southern Italy ( local )
- serial ( sobekcm )
- Spring discharges of a large karst system (Campania, Southern Italy) have been analysed to determine if they were related to rainfall and periods of poor recharge. Due to the Mediterranean climate and hydrogeological conditions of the aquifers, the spring hydrographs are generally characterised by one annual smoothed peak during spring season and a negligible quick flow component. Insufficient recharge due to poor annual rainfall results in flat spring hydrographs (with no peak) that indicate a continuously decreasing discharge. Flat spring hydrographs reveal a drought, which is characterised by a prolonged shortage of water that induces a reduction in discharge during the following year as well. Droughts also appear to be induced by consecutive years with lower than average rainfall.
The historical data have shown that each hydrological year depends on the previous year because annual rainfall series do not have a random character and aquifers have a â€œmemory effectâ€, which results in spring discharges amplifying the effect of poor rainfall.
Due to a long historical series and the specific karst spring regime, a flat hydrograph can be forecast as early as winter, thereby providing a useful tool for water management. The time-lag between rainfall and spring discharges has been utilised to determine the amount of rainfall required to avoid a drought.
- Original Version:
- Journal of Hydrology, Vol. 373, no. 3-4 (2009-07-15).
- Source Institution:
- University of South Florida Library
- Holding Location:
- University of South Florida
- Rights Management:
- This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.
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